Major Forms of Cellular Adaptation Flashcards

Review of atrophy, hypertrophy, hyperplasia, metaplasia, and dysplasia

1
Q

Cells can adapt through modulation of their…

A

size, shape, metabolism, and behavior

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2
Q

What are five major forms of cellular adaptation?

A
  1. Atrophy
  2. Hypertrophy
  3. Hyperplasia
  4. Metaplasia
  5. Dysplasia
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3
Q

What is atrophy?

A

Shrinkage of a cell or organ due to loss of organelles
An adaptation to diminish need or resources for cell activity

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4
Q

What is physiological atrophy?

A

A normal loss of endocrine stimulation
ex. lack of use (reversible)

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5
Q

What is pathological atrophy?

A

Diminished blood supply, inadequate nutrition, loss of innervation, abnormal loss of endocrine stimulation, decreased workload
ex. paraplegia (atrophy to limbs)

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6
Q

What is hypertrophy?

A

An increase in cell size and functional capacity

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7
Q

Increase in production and number of intracellular organelles (hypertrophy) will mean what for metabolic demands?

A

Increased metabolic demands on the cell/hormonal stimulation

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8
Q

What is physiological hypertrophy?

A

Increased functional demand
ex. working out and building muscle

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9
Q

What is goiter?

A

A pathological hypertrophy enlarging the thyroid gland

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10
Q

A hormone secreting tumor will mean what for an endocrine gland?

A

Hyperactivity

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11
Q

High blood pressure can lead to heart hypertrophy. What kind of hypertrophy is this?

A

Pathological

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12
Q

Excessive abnormal demands on an organ will lead to which adaptation?

A

Pathological hypertrophy

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13
Q

What is hyperplasia?

A

Increase in the size of an organ or tissue due to an increase in the number of cells

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14
Q

What are examples of physiological hyperplasia?

A

Hormonal stimulation in lactating breast, increase in RBCs at high altitude

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15
Q

What are examples of pathological hyperplasia?

A

Endometriosis, psoriasis, liver regeneration following damage

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16
Q

What is metaplasia?

A

A change where one terminally differentiated cell type is replaced by another terminally differentiated cell type

17
Q

What is metaplasia a response to?

A

Persistent injury/irritation

18
Q

Commonly, glandular epithelium is replaced by…

A

squamous epithelium

19
Q

Describe Barret esophagus

A

Simple columnar metaplasia creeping up esophagus

20
Q

Give two examples of squamous metaplasia

A

Bronchus, bladder

21
Q

What is myositis ossificans?

A

After injury, soft tissue (muscle) will behave like bone showing bright on a radiograph

22
Q

What is dysplasia?

A

Disordered growth and maturation of the cellular components of a tissue

23
Q

Loss of uniformity of cells as well as loss in architectural orientation describes what adaptation?

A

Dysplasia

24
Q

Dysplasia is a response to…

A

persistent injurious influence; may regress

25
Q

Severe dysplasia is considered an indication for what type of care?

A

Aggressive preventive therapy to cure

26
Q

Which adaptations may give rise to neoplasia?

A

Dysplasia, hyperplasia, and metaplasia

27
Q

Which adaptation always leads to neoplasia?

A

Dysplasia